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eco-

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  1. a combining form representing ecology in the formation of compounds (ecosystem; ecotype); also with the more general sense “environment,” “nature,” “natural habitat” (ecocide; ecolaw; ecopolitics).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for eco-

eco-

combining form
  1. denoting ecology or ecologicalecocide; ecosphere
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eco-

word-forming element referring to the environment and man's relation to it, abstracted from ecology, ecological; attested from 1969.

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Online Etymology Dictionary, © 2010 Douglas Harper

eco- in Medicine

eco-

pref.
  1. Ecology; ecological:ecosystem.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.